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To determine if the type of agar affects bacterial growth, a scientist cultures on four different types of agar. Five petr dishes are set up

To determine if the type of agar affects bacterial growth, a scientist cultures on four different types of agar. Five petr dishes are set up to collect results:
One with nutrient agar and E. coli
One with mannitol-salt agar and E. coli
One with MacConkey agar and E. coli
One with LB agar and E. coli
One with nutrient agar but NO E. coli
a. Independent Variable:
b. Dependent Variable:
c. Controls:
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